SYNTHETIC FULVIC ACIDS FROM TANNIN
DOI:
https://doi.org/10.15421/082027Keywords:
tannin, fulvic acid, synthetic humic substancesAbstract
This research introduces a new, simple and effective method of producing synthetic fulvic acids from tannin. The synthesis is based on the reaction of tannin oxidation by pure oxygen in a highly alkaline environment. The conversion of fulvates to the acid was achieved by passing the resulting mixture through a cation-exchange column in the H-form. The resulting dark-brown product solution has a pH = 2. A complex study of the physicochemical and spectroscopic properties of the obtained product using the methods of elemental analysis, ultraviolet-visible, infra red and electron paramagnetic resonance spectroscopy, scanning electron microscopy, X-ray diffraction showed the similarity of the obtained product to natural fulvic acids. Synthetic fulvic acids are advantageous over natural humic substances due to their reproducible properties as a result of their strict synthesis conditions. This significantly expands the scope of their application, in particular in medicine, where one of the prerequisites is the standardization of properties.
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